Abstract
The PC wire in the PC structural members is always subject to dynamic load. Bridges and rail-road ties, for example, strain whenever heavy vehicles pass over them. Therefore the load on PC wire fluctuates with the prestressing load as its center.
No report has ever been published on how the PC wire behaves in terms of stress-relaxation when the load changes from time to time. The authors have developed a special device to examine the relaxation behavior of PC wire when fluctuant loads are applied. In this paper the test results are presented and discussed.
